Tube-welding furnace



(No Model.)

H. JEFFREY.

TUBE WELDING FURNACE. No. 412,187. Patented Oct. 1, 1889.

W I'INESSES: IN'7N'IOR UNITED STATES PATENT EEicE.

HARRY JEFFREY, OF LUDLO /V, KENTUCKY, ASSIGNOR OF ONE-HALF TO FRED.HOEFFLIE, OF MERIDIAN, MISSISSIPPI.

TU BE-WELDING FU RNACE.

SPECIFICATION forming part of Letters Patent No. 412,187, dated October1, 1889.

Application filed August 8, 1887.

To aZZ whom it may concern:'

Be it known that I, HARRY JEFFREY, of Lud1ow,in the county of Kenton andState of Kentucky, have invented a new and useful Improvement in Tube-Welding Furnaces, which improvement is fully set forth in the followingspecification and accompanying drawings, in which- Figure I is a frontview of my furnace, partly in section. Fig. II is an end or side view ofthe same; Fig. III, topview, and Fig. IV perspective view ofthe hood.

The object of this invention is to construct a furnace capable ofproducing an extra amount of heat for rapidly heating metalbars, tubes,and other articles to be welded; and it consists of a structure made,preferably, of firebrick, wherein the lower part of the interior isV-shaped in form, having two vertical chambers, (one on each side of thecentral fire-chamber space,) in which the mass of coal is to be placed,the central space being provided with an inclined U-shaped hood andbeing provided beneath a V-shaped coal-space with a pipe which connectswith a blast-fan, so that when air is forced through the pipe it willpass up through the mass of the coal centrally and escape from the coalat a point beneath the hood, all of which will now be fully set forthindetail.

A rep resents the outer wall of the structure, which is composed of theside walls a, Fig. III, and the front and rear walls a a respectively,and is preferably made rectangular in horizontal section, the base ofthe chamber within being inclined at each end at an angle of aboutforty-five degrees, as shown at B. These lines B converge toward thecenter, a grate 0 being placed at their base. The walls a" a areprovided with rectangular instanding ledges or shoulders N flush withthe tops of the inclines B. The chamber D thus formed is to receive thecoal. Vertical chutes E E extend up from the fire-chamber D on each sideof the central space F. The inner walls G G of the chutes are slightlyinclined, so as to enable the hood H, which is placed in the space F, tobe readilywithdrawn. The chuteplates G are slid in grooves g, Fig. III,into position, the said grooves retaining them in Serial No. 246,438.(No model.)

The hood H is preferably made of place.

be made of any fire-brick, although it may other suitable material, andis provided with I a handle I on top. This hood is designed to be placedin the space F directly over the hole in or top of the chamber D. Thepipe J from the blast-fan passes through the ashchamberK to the grate C,so that the force of the blast will be exerted upward through the massof the coal to the region of the hood, causing the superheated flamefrom the burn ing coal to rise beneath the hood, where it is confined,in a measure, thereby.

As the action of the blast generates a large amount of gas, it isdesirable that the workmen shall be protected from it as much aspossible, and in order to do this I have provided a pipe L, the lowerend of which is connected with the blast-pipe J, and the upper end ofwhich extends to the hood,so that when the blast is forced through thepipe J a portion of the air will be directed through the pipe L to thehood and blow the gases out of the hood. The pipe L has a valve L, so asto regulate the draft, as desired. If desired,one or both sides of thishood may be partially closed by means of suitable doors, so as to stillfurther confine the direct action of the blast within the hood, and thusincrease the temperature. The top of the chutes E may or may not beclosed; but in either event the blast from the pipe J will pass throughthe coal at the point of least resistance, which will be the pointcovered by the hood, and as the bottoms B are inclined it is obviousthat the coal placed in the chute E will move down of its own gravity,and thus automatically feed coal as it is desired.

The advantage in this form of furnace is that the article to be welded,which is placed in the furnace below the hood, does not come in contactwith the coal, and it is not necessary in heating the metal toconstantly stir up the coal in order to insure a welding heat. The loweredges of the sides of the hood H rest upon the ledges or shoulders N,which also widen the bearing-surfaces upon which the tubes to be weldedrest.

\Vhat I claim as new is In a tube-welding furnace, the combination of afurnace-chamber having aV-shaped b0t- In testimony that I claim theforegoing I tom, the grate 0, plates G, f.orn1ing the inner havehereunto set my hand, this17th day of Walls of said chutes E, theremovableV-shaped June, 1887, in the presence of Witnesses.

hood H, the blast-pipe J, arranged under the HARRY JEFFREY. 5 grate, andthe branch air-pipe L, opening into \rVitnesses:

the hood H, said branch pipe having a valve ROBT. S. MILLAR,

L, substantially as specified. ROBERT RAMSEY.

